The House Intelligence Committee abruptly canceled a briefing set for Thursday on alleged Russian interference in the U.S. election, after intelligence agencies refused to provide representatives for the session, Fox News is told.

Amid concerns about reports that conflict with details previously provided to the committee, Chairman Devin Nunes, R-Calif., had requested a closed, classified briefing Thursday for committee Republican and Democratic members from the FBI, CIA, Office of the Director of National Intelligence and National Security Agency.

But Fox News is told the agencies refused to provide briefers, which is unusual given the panel is the most-senior committee with jurisdiction.